The 20-pair colour code is a
colour code
A color code is a system for displaying information by using different colors.
The earliest examples of color codes in use are for long-distance communication by use of flags, as in Flag semaphore, semaphore communication. The United Kingdom a ...
used in Australia to identify individual conductors in a kind of electrical
telecommunication wiring for indoor use, known as
twisted pair cables. The colours are applied to the insulation that covers each conductor. The first colour is chosen from one group of five colours.
The combinations are also shown in the table below showing the colour for each wire ("1" and "2") and the pair number.
The Australian standard specifies "Grey" in Tables B2 to B7. There are systems in other countries where "Slate" is used rather than "Grey". This is perceived as a minimisation of confusion between "Green" and "Grey" and their potential abbreviations: "G", "Gr", or "Gre". No such consideration is made for "Black", "Blue", or "Brown", or their potential abbreviations of "B", "Bl", or "Br".
Sources
* www.commsalliance.com.a
See also
*
25-pair colour code
The 25-pair color code, originally known as even-count color code, is a color code used to identify individual conductors in twisted-pair wiring for telecommunications.
Color coding
With the development of new generations of telecommunication ...
{{Commons, Color code
Color codes
Telephony equipment
Telecommunications in Australia